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Mythic Sleeping Bag: 20F Down
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Elite warmth-to-weight performance in the Mythic 20F Sleeping Bag
What Our Gearhead® Experts Are Saying:
"I reach for the Mythic 20F when pack weight really matters. The 900FP down and TILT lining make it feel warmer than the rating suggests, and the loft stays impressively consistent for such a light bag. It’s ideal for fast-and-light missions where you still want real overnight warmth."
We choose the Mythic 20F Sleeping Bag when efficiency is the priority and every gram counts. Designed for moving fast through cool mountain conditions, it delivers serious warmth in an ultralight, highly packable build that disappears into a small pack without compromising overnight comfort.
The Mythic uses L.O.F.T 3D™ baffle construction to minimize down migration and eliminate cold spots while reducing overall weight. Premium 900FP European goose down pairs with a heat-reflective TILT lining to trap warmth more efficiently, allowing less insulation to do more work. A tapered mummy shape, down-filled neck collar, and anatomically shaped hood and footbox maximize thermal efficiency, while the ultralight 10D Pertex® Quantum shell enhances loft and compressibility. Built for precision and speed, it’s a top-tier choice when weight and pack size are critical.
Details
- Built for fast-and-light backpacking and alpine missions
- 900FP goose down delivers exceptional warmth-to-weight
- TILT lining reflects heat to reduce warmth loss
- L.O.F.T 3D™ baffles eliminate cold spots and reduce weight
- Ultralight 10D Pertex® Quantum shell boosts packability
- Tapered mummy shape maximizes thermal efficiency
- Item #RABZ11U
- Responsible Collection
- Recycled/Repurposed, Responsibly Sourced
- Material
- [face fabric] 10D Pertex Quantum (100% nylon ripstop, PFC-free DWR finish), [lining] 10D Atmos (100% recycled nylon), Thermo Ionic Lining Technology
- Insulation
- 900-fill RDS-certified down, Grangers PFC-free hydrophobic finish
- Shape
- mummy
- Zipper
- 1/2-length
- Bag Length
- regular, long
- Fill Weight
- 12.5oz
- Degree
- 20F
- Storage Sack
- included
- Stuff Sack
- compression
- Claimed Weight
- 1lb 8.69oz
- Activity
- backpacking
- Manufacturer Warranty
- limited lifetime
We Are The Mountain People
Rab makes rugged, high-performance clothing and equipment that give you absolute protection, comfort, and freedom in the mountains.